Change userid from a uint32_t to a string guid

mojo/shell/public/cpp/lib/connector_impl.cc

Index: mojo/shell/public/cpp/lib/connector_impl.cc
diff --git a/mojo/shell/public/cpp/lib/connector_impl.cc b/mojo/shell/public/cpp/lib/connector_impl.cc
index 675017d4985f745da44b0cdc21712a3a78f8f617..d6d0e51a685672a1287353cb488571b21a6c7b82 100644
--- a/mojo/shell/public/cpp/lib/connector_impl.cc
+++ b/mojo/shell/public/cpp/lib/connector_impl.cc
@@ -10,7 +10,7 @@ namespace mojo {
 
 Connector::ConnectParams::ConnectParams(const std::string& name)
     : name_(name),
-      user_id_(shell::mojom::Connector::kUserInherit) {
+      user_id_(shell::mojom::kInheritUserID) {
 }
 Connector::ConnectParams::~ConnectParams() {}